Closure operating mechanism



May 30, 1933. E. L DUNN CLOSURE OPERATING MECHANISM Filed May 28, 1952 4 Sheets-Sheet 1 ATTOR NEY Flab gd mzvo Lu, fflwvm INVENTOR May 30, 1933. U 1,911,818

CLOSURE OPERATING MECHANISM Filed May 28, 1952 4 sneet s-sheet 2 FIGZ EMA Lac 1144M INVENTOR ATTORNEI' May 30, 1933. E, L. DUNN 1,911,818

CLOSURE OPERATING MECHANI SM Filed May 28, 1952 4 Sheets-Sheet 3 I65\ 57 56 o E o o O so u INVENTO'R ATTORNEY y 0. 933- E. L. DUNN 1,911,818

CLOSURE OPERATING MECHANI SM Filed May 28, 1932 4 Sheets-Sheet 4 95 84' J o 7 i 72 9 85 73 55 X e Z Z 91 L 5 90 62 so 57 0 0V m I g 47 my f I FIGS I W Lu 213m INVENTOR BY ATTORNEY Patented May 30, 1933 warren sra'res Enwaan LEE norm, or MONTCLAIR, New Jnnsnr, assronoa T0 orrs nLnveron 00M- IANY, or NEwYoaK, 1\T.Y., A CORPORATION or NEW JERSEY oro'suan OPERATING MECHANISM Application filed May 28,

The invention relates to closure operating mechanism and especially to operating mechanism for the car and hatchway doors of elevator installations.

tionsto operate the closures controlling access to the elevator car by power mechanism. The. closures may be both opened and closed by power mechanism or only the opening operation may be performed by power with the closures arranged to be selfciosing. Power mechanism may be employed to operate both the hatchway door and car door or to operate either one of them. In the case of the hatchway doors, it is of advantage to employ the same power mechanism to operate all the hatchway doors for one elevator car. This avoids the duplication of the power devices at each of the landings served. The operation of the several hatchway doors by the same power mechanism is usually accomplished by l1lV-' ing the doors disconnected from the power mechanism during running of the car and, when a stop is made at floor, by coupling the power mechanism to the door at that floor. It is also of advantage, in cases where both the car door and hatchwa-y doors are power operated, that the same power mechanism be employed for operating the hatchway doors and the car door. \Vhen the same power mechanism is employed for these doors, it is desirable that the mechanism be carried by the elevator car as this arrangement lends itself to simplicity of construction.

It is of further advantage, in installations in which the car and hatchway doors are power operated, that the operating mechanism be arranged to permit manual operation of doors, as in case oti'ailure'of the power for operating the power mechanism. It is desirable in such arrangements that the doors be disconnected from thecpow'er mechanism for manual operation so that the person operating the doors is not required to exert added force to operate the power mechanism.

The present invention is directed to mechanism for operating. an elevator closure by t is desirable in many elevator installa res-a. Serial No. 614,071.

power which permits the ready manual operation of the closure.

One feature of the invention resides in the provision of mechanism for operating an elevator closure which is disconnected from the closure so as to permit operation of the closure manually unaffected by the operating mechanism.

Another feature resides in the provision of mechanism for operating both the car door and hatchway door which is disconnected from both doors when they are closed so as to permit their being opened manually unaffected by the operating mechanism.

A third feature is the arrangement of the mechanism for operating the car door and hatchwav door so-that the doors aredis connected from the operating mechanism and from each other when the doors are closed, thus permitting the independent manual opening of each door without the application of additional manual force to operate the operating mechanism.

A-fourth feature is the arrangement of the operating mechanism for the car and hatchway doors so thatthey are disconnected from the operating mechanism and from each other when the doors are closed but automatically become locked together and to the operating mechanism upon operation of this mechanism to openthe doors.

A fifth feature is the provision of operating mechanism for elevator doors which is of very simple construction and yet is entirely positive and reliable in operation.

Other features and advantages will become apparent from the following description and appended claims. I

In the drawings:

Figure 1 is aside View, with parts in outline for purposes of simplification, of a portion of an elevator car and a landing at which the car is stopped, illustrating operating mechanism for the car and hatchway doors in accordance with the principles of the invention, the doors being illustrated in closed positions;

Figure, 2 is a view in elevation, as viewed from inside the hatchway, of. the. arrangement of the operating mechanism of Figure 1 as applied to the hatchway door, the View being taken along the line 22 of Figure 1;

Figure 3 is a view in elevation, as viewed from the outside of the car, of the operating mechanism of Figure 1 and illustrating its application to the car door, the view being taken along the line 33 of Figure 1;

Figure l is a .fragmental view similar to Figure 3 but with the car door in open po-' sition, a portion of the operatingmechanism for the hatchway door being included, the View being taken along the line 4-4 of F igure 1;

Figure 5 is a plan view of the arrangement shown in Figure 1; and

Figure 6 is an enlarged sectional view of the door engine of suitable power mechanism for operating the doors.

Referring to Figures 1 to 5 inclusive, one embodiment of the mechanism for operating the car and hatchway doors in accordance with the invention is illustrated. The mech anism is shown for the hatchway door at one of the floors served by the elevator car, it being understood that the arrangement is the same for the hatchway doors at all the otherv floors served by the car. In the description which follows, it will be assumed that the car is stationed at the floor at which the door is located.

Referring particularly. to Figures 1, 2 and 5, the hatchway door, designated 20, is 1'1- lustrated as a single section door of the slidable type. The door is supported by hangers 21 operating on a track 22. This track is mounted on the hatchway wall and acts to guide the door at the top in its opening and closing movements, the hangers being provided with supporting sheaves 23 which ride on the track. The door is guided at thebottom by the usual guide channel 24: into which guides secured to the bottom of the door depend.

. Brackets 25 and 26 are secured to the rear of the. door. Apair of spaced guide rods 2'? are mounted between these brackets. These rods slidably support a crosshead 28. A stop 30 is adjustably mounted on rods 27, between the crosshead and bracket 26. This stop and bracket 25 act to limit the amount of movement of the crosshead on the rods. Resilientmembers are provided on the rods for cushioning the crosshead as it reaches its limits of movement. These members have been illustrated as rubber bumpers 31 abutting bracket 25 and springs 32 abutting stop 30.

Both the opening and closing of the door is effected through the intermediary of a lever 33. This lever is connected to the crosshead by links 34. A weighted member 35 is secured to lever 33 near the upper end thereof. This member is'pivoted to a bracket 36 mounted on the hatchway wall. This forms the pivot forthe lever.

A roller 37 is carried between links 34.

vThis roller extends into a depression 38 in bracket 26, when the hatchway door is closed and the crosshead is in engagement with bumpers 31. This roller cooperates with a shoulder 40 formed on bracket 26 to lock the door in closed position. The initial movement of lever 33 about its pivot in a direction to open the door, moves roller 37 out of the depression sufiiciently to permit it to move downwardly past the shoulder 40 as continued movement of the lever takes place, thus unlocking the door. During this unlocking movement, crosshead 28 is moved on rods 27 toward springs 32 and, as the door becomes unlocked, engagement of the crosshead with the springs takes place. Should an attempt be made to open the door from the corridor, no relative movement of the crosshead and door takes place. As a result, the pressure exerted in the. attempt to open the door causes roller 37 immediately to bind against shoulder 40 as it attempts to move downwardly, thereby preventing the opening of the door.

The door is movedto open position, after the unlocking operation takes place, by crosshead 28 being pushed against springs 32 by the lever. The door is moved to closed position by roller 37 being pushed against shoulder 40 by the lever. The weighted member 35 acts to move lever 33 in a direction about its pivot to effect the door closing operation, thus biasing the door to closed position. The manner in which force is applied to move the lever in a direction about its pivot to effect the door opening operation will be explained later.

The mechanism is arranged so that the hatchway door, upon being moved to open, position by lever 33, also opens the door on the elevator car 41. This may best be seen by reference to Figures 1, 3, 4i and 5. The car door has been illustrated as of the two speed slidable type, i.'e., one in which the door is arranged in two slidable sections with one section moving at twice the speed of the other in the opening and closing operations. Both the fast speed section, designated 45,-and the slow speed section, designated 46, are supported by hangers 17. The hangers for the fast speed section operate on a track 48 while those for the slow speed section operate on a track 50. These tracks are mounted on a supporting member 51 extending between and secured to uprights 52 of car sling 53. "The tracks act to guide the tops of the door sections in their opening and closing movements, the hangers being provided with supporting sheaves which ride on the tracks. Guide channels 54 are provided for guiding the sections at their bottoms.

A bracket 55-is secured to the forward end of fast speed "door section 4.5 on the outer side thereof; Another bracket -56 is secured to the rear edge of doorsection 46 and extends outwardly therefrom. Bracket 55 is arrangement connects the ooorzsections to- Cir get-her for simultaneous movement, the points of connection being such that the "fast speed section moves at twice the speed of the slow speed section both in the opening and closing operations.

The weightedmember 62 acts to move lever 57 about its pivot in a direction to efiect the closing of the door sections, thus biasing the car door to closed position. Opening of the car door is effected hrough the intermediary of crosshead 28- The crosshead is provided *ith a cam 64 which extends there from toward the car door. A buffer plate 65 is secured tofast speed door section to be engaged by cam 64. In the arrangementillustrated, abracket 66 is secured to door sect-ion This bracket, extending across links 58, is set out from the door sec} tion by spacers a. sufiicientdistance and is of sufiicient length to permitoperation of these links. The bracket is formed with-a support 67 for the bufier plate. Buffer plate is provided with guides 68 which slidably extend through apertures provided in support 67, the support extending outwardly a sufficient distance to place the bufie'r plate in the path of movement of the cam. Springs 70 are provided on" guides 6813ctween the buffer plate and its support. Clearance is provided between cam 64 and plate 65 to insure that the plateis not struck by the camas the car passes the floor.

Upon the crosshead being moved into engagement with springs 32 by lever cam 64 engages plate 65 and, as lever 33. continues its movement to move the hatchway door to open position, cam 64" is'pulled against plate 65 to move the car doorto open position. Thus, the car door "and hatchway door are opened simultaneously. Springs 32 and 70 act to eliminate any shock, upon the hatchwaydoor and the" car door being picked'up by crosshead 28, as lever 33 is operated in the door opening direction, Rotative movement of lever 83. to effect the opening "of the car and hatchway doors is effected by a cam 71 which is pushed against a roller 72 on the end of the lever. This cam is carried by the elevator'car. Clearance is provided'between the cam and the roller to insure that the roller is not struck by the cam as the car passes the floor. Asmay be seen byreference to Figure 3, cam 71 is mounted on across memher 7 3 whichextends between and is support- 'ed by cranks 74 and 75. A spacer 76 is provided between the cam and cross member 73 so-as to extend the cam outwardly a sumcient distance to engage roller 72." Cranks 74 and 75 are supported by pedestals 77 and 78 respectively. These pedestals are mounted on supporting member 51. Crank 75 simply serves as a support for'one end of cross member 73 and isrotatablymounted on "a stub shaft 80 secured to pedestal 78. Crank 74, however, serves not only as a support but as an operating member for cross member 73 and is secured to a shaft 81 rotatably supportedyby pedestal 77 and a bracket 82 secured to the crosshead 83 0f the car sling.

Rotativemovement of shaft 81 clockwise, as viewed in Figure 8, causes cross member 73 to be movedto the right by' crank 74, pushing cam 71 against roller 72 to effect the door opening operation of lever Lever 57 for the car door is provided at its end with a roller 84. An additional cam is provided on cross member 73 The working face of this cam faces that of cam 71. The spacing between the cams is such asto'perinitroller 84 to move up beside the working face of-cam 85 as the initial opening movementof the doors takes place. Cam 85 is positioned over roller 84 when the parts are in' door closed position owing to the clearance provided between cam 71 and roller 72 and that provided between cam 64 and plate 65. Cam 85' is shifted into position to receive roller 84 as a result of the movement of cross member 73 to take up the clearance between cam 71 androller 72 and between cam 64 and plate 65 before movement of roller 84 takes place. Once roller 84 has moved up besidev cam 85, the'remainder of thedoor opening operation is effected with the rollers in the channel thus formed by cams 71 and 85. This may be seen by reference to Figure 4 in which the parts are illustrated with the doors in open position. The levers 33 and 57 and therefore the car and hatchway doors are thus locked to gether for simultaneous operation, This ins sures positive control of both doors by power mechanism which is common to both doors.

Als0,'this arrangement prevents coasting in 1 case of a reversal or movement of the doors, as will be explainedmore' fully later.

Interlock switches are providedfor preventingoperation of the car unless the car and hatchway doors are closed. The hatchway' door interlock switch, designated 86, and the car door interlock switch, designated 87 ,are illustrated as of the same construction. Each'of these switches is spring biased to closed position.

The details 1 of construction of the switches, other than a schematic showing of their operating levers 88 and rollers 90, arenot illustrated. The switches are positioned to be operated by camming surfaces 91 on the weighted members 35 and 62. Hatchway door switch 86 is mounted on the hatchway wall and in position to be opened by the engagement of its roller by weighted member 35'just before the door becomes unlocked. Car door switch 87 is mounted on aplate 92 supported by pedestal 77 and in position to be opened by the engagement of its roller by weighted member 62 as the initial movement of lever 57 takes place. 7 I

Rotative movement of shaft 81 to push cam 71 against roller 72 and thus effect the opening of the doors may be imparted in various ways. An arrangement has been illustrated which is suitable for this purpose and has many advantages as operating mechanism for elevator doors. In this arrangement, an additional crank 95 is secured to shaft 81 between pedestal 77 and bracket 82. This crank is pivotally connected by a coupling 96 to a length of tubing 97. 'A cou pling 98 connects tubing 97 to the piston rod 100 of a fluid operated door engine.

Referring to Figure 6, the door engine has a casing made up of two sections 101 and 102 of pipe or tubing. The upper section 101 is provided at its top with acap 103 and at its bottom is threaded into a member 104. The upper end of section 102 is threaded into member 104 and its lower end is threaded into a member 105. Two chambers 106 and 107 are thus provided, one within section 101 and the other within section 102. Member is provided with a bracket-like extension 109, by means of which the door engine is mounted on the car (see Figure 3). Y

The cylinder 108 of the engine is arranged Within section 102 and member 105. At the top, the cylinder is tightly fitted into a counterbore 110 in member 104. From this point it extends downwardly through chamber 107 into openings lll prov'ided in member 105 and in which it is'tightly fitted. Below these openings it extends into a chamber 112 formed in the bottom of member 105. The lower end of chamber 112 is closed by a plug 113. This plug'has an extension 114 of reduced diameter extending. upwardly into the chamber. The extension is provided witha flange portion on which the lower end of piston cylinder 108 is tightly fitted.

An elongated piston 115 is provided within cylinder 108 and is. secured to the lower end of piston rod '100, as by nut 116. The piston rod extends upwardly through the cylinder and'section 101 of the. casing to coupling 98. The rod is guided in an opening 117 formed therefor in member 104 and annaddition al opening 118 in the cap 103. A ,stufling box 120 is provided in cap 103 .for the piston rod. -=Upward movement of the piston for rotating shaft 81'in a direction to open the doors is effected by admitting fluid under pressure beneath the piston. The doors are heldin open position by maintaining fluid beneath the piston but at a reduced, pressure. The closing of the doors and the return of operatingpartsto door closed positions is effected by gravity, the combined weight of the piston, piston rod, tubing 97, couplings, crank 95 and weights 35 and 62, acting to bias the doors to closed position. More rapid return movement may be obtained, if desired, by exhausting the fluid from cylinder 108 beneath the piston. All this will be explained later in more detail. A certain amount of clearance is provided between the piston and the cylinder to insure free movement of the piston during operation of the engine. With this clearance, it is preferred that. the piston be provided with sealing grooves 121 as illustrated. It is also preferred to provide a kick-0E spring for the piston. Such spring, designated 122, is illustrated. This spring is carried on the top of the piston. When the doors are held in full open position, this spring is compressed between the piston and member 104- at the top of counterbore 110. Upon the doors being released, the spring acts to give the piston a quick start upon its downward movement.

Chamber 112 receives fluid under pres sure for moving the piston upwardly in the cylinder, and will hereinafter be referred to as the pressure chamber. A conduit 123 is threaded into an aperture 124 pro-vided in member 105 and leading into the pressure chamber. This conduit is connected to the discharge side of a fluid pump. Fluid is supplied from the pressure chamber to the cylinder 108 beneath the piston through a series of passages 125 extending into the extension 114 and communicating with a port 126 formed in this extension. A check valve controls the communication between the pressure chamber and the interior of the piston cylinder. This check valve comprises a ball127 mounted in an opening in extension 114 at the upper end of port 126. A pin 128 is provided to prevent the escape of ball 127 from this opening.

Member 105 is formed with a small chamber 130 below section 102 of the casing, and in communication with chamber 107. A conduit 131 is threaded into an aperture 132 provided in member 105 and leading into rhai'nber. 130. Conduit131 isconnected to liquid tight bushing 148 in the plug.

which is drawn therefrom by the pump through conduit 131 to be supplied to cylinder 108 beneath the piston. These chambers therefore constitute a fluid supply reservoir.

Initially, the fluid is supplied to the supply reservoir through a riser tube 135. This tube is connected to passage 133 by an cl bow 136 threaded into an aperture 137 provided in member 104 and leading into the passage. Frei'erably a non-compressible fluid used and a suflicientamount otthis fluid is supplied to the engine to bring the height of the fluid level to the topofthe riser tube. The top of this tube is normally closed by a cap 138. The fluid supply reservoir is vented by a passage 140 provided in cap 103. i

The engine is preferably arranged to check the movement of the piston at both ends of its stroke. To provide a check for cushioning the piston at the end of its clownward stroke, a passage 141 is formed in plug 113 and extends from the interior of cylinder 108 to a chamber 142 formed in the plug.

This chamber is in communication with pressure chamber 112 through an additional passage 143 formed in the plug. Passage 141, chamber 142 and passage 143 thus conl'stitute a bypass around the check valve to permit the passage of fluid from the cyl1n- I der to the pressure chamber during clownward movement of the piston.

A plurality of ports 144 are -formed in the 5 wall of cylinder 108 and provide passages for fluid from the cylinder to a smallchamher 145 formed in member 105. A passage 146 connects this chamber with pressure chamber 112. This also constitutes a by- .pass around the check valve to permit the flow of fluid from the cylinder to the pressure chamber during downward movement of the piston. Upon the piston nearlng the bottom of the cylinder it closes orts 144' r I 7 P Llhe check valve being closed atthis time,

this leaves only passages 141 and 143 to conduct the fluid from beneath the piston back to the pressure chamber, thus starting the cushioning action. The effective area of the hy-pass through these passages and therefore the rate at which the downward movement of the piston is checked may be regulated by adjustment of a needle valve 147 which extends into chamber 142 through a An adjustable stop collar .150 is provided on piston rod 100. The collar engages cap 103 to bring the piston tofa' final stop.

To provide a check for cushioning the piston at the end of its upward stroke, a pocket 151 is formed in member 104 above counterbore 110. A passage 152 connects this pocket with chamber 107. A plurality of ports 153 are formed in the wall of cylinder 108 near the top thereof and provide passages to permit the flow of fluid between the cylinder and chamber'107p Thus, fluid flows through these passages during down ward movement of the piston, filling the cylinder above the piston. During upward movement of this piston, the fluid is pushed out of the cylinder through these passages;

Upon the piston nearing the top of the cylinder, it closes ports 153. This leaves only the passage 152 to conduct fluid from the cylinder back to the supply reservoir, starting the cushioning action. The effective area of passage 152 and therefore the rate at which the upwardmovement'of the piston is checked may be regulated by adjustment of a needle valve 154 which extends intov the passage through liquid tight bushreaches a point where sufficient area is provided through the ports to reduce the fluidpressure to a point where it is just suflicient to counteract the forces biasing the doors and operating parts for return movement, the piston comes to a stop.

The rate of downward movement of the piston maybe regulated by adjustment of a.

needle valve 156 which extends into passage 146 through a liquid-tight bushing 157 in member 105. The rate of upward movement of the piston may be regulated in a similar way. A passage 158 connects chamber 145. with chamber 130. A needle valve 160 8X- tends into the passage through a liquid-tight bushing 159in member 105. Passage 158 provides an escape for the fluid from the pressure chamber and the cylinderbeneath the piston back to the supply reservoir during upward movement of the piston. Needle valve 160 is adjusted to restrict the effective area of passage 158 and thus regulate, the

amount of fluid which-flows therethrough. By thus'controlling'the amount of the supplied fluid which is by-passedback to the supply reservoir, the rate of upward movement of the piston may be regulated.

The pump 161 for supply fluid to the engine'is of the rotary type. The rotor of the pump is provided with impeller blades around its periphery with sufficient clearance between the blades and the pump casing to permit back flow when the pump is stationary. The pump is arranged so as to force fluid from" or draw fluid into its discharge opening, as by having both thedischarge and intake openings of the pump casing at the periphery of the rotor.

The pump is driven by an electric motor 162. The pump and motor are carried by the elevator car beneath the car platform, a support 163 being provided forthe purpose. This support is located near the engine, thus affording short discharge and intake pipes 123 and 131. The energization of the motor to operate the pump may be controlled in any suitable manner, depending upon the type of system of control for the elevator car and the requirements of the particular installation.

In operation, assume that both doors are closed and that control mechanism is operated to efiect the energization of motor 162. The motor, upon operation, drives pump 161 to draw fluid from the supply reservoir through intake conduit 131 into the pump casing. The impeller-blades of the pump force the fluid'into the discharge outletof the pump and from there, by way: of discharge conduit-123, to the pressure chamberv 112 of the engine. The pressure builds up very rapidly causing the immediate lifting of ball 127 of'thecheck valve off its seat to i hatchway door.

permit the passage'of fluid from the pressure chamber into the piston cylinderlOS. The fluid forced under pressure into the piston cylinder'raises piston 115. The piston, in turn, acts through piston rod 100, tubing 97 andcrank 95 to'impart rotative move-- ment to shaft 81 for the door opening operation.

Shaft 81, upon rotative movement, moves cam 71 into engagement with roller 72 and 3 thereafter'pushes the cam against-the roller to niove lever 33 about its pivot to effect the opening of the doors. The initial movement of lever 33 opens switch 86 and moves roller 37 out of depression 38 to unlock the unlocked, crosshead 28 engages springs 32 on rods 27 and its cam 64 engages buffer plate 65. At this point cam 85=is in position to receive roller 84. Continued movement of lever 33 opens switch 87 and moves the carand hatchway doors to open position,

roller 84 moving up beside cam 85 during the initial movement so as to lock the doors together for simultaneous operation.

Upon the doors nearing open positions,

piston 115 cuts off ports 153 to start the- The hatchway door is slowed down owing to its connection to lever 57 -through stop 30,

springs32, crosshead 28. cam 64, plate '65, springs 70 and bracket 66. Upon the piston reaching a point where it uncovers sufiicient area of ports 153 to reduce the pressure be-,

neath to where it just counteracts the forces biasingthe doors and operating parts for re- Just as the door becomes The car door is slowed down owing to its direct connect-1011 to lever 57;

turn movement, the doors and piston come to a stop. Motor 162 IS maintained energized so long as it is desired to maintain the doors open 0 the piston in its raised position. Accordingly weights 35 and 62 act to return the doors to closed position, assisted: by the weight of crank 95, tubing 97, piston .rod 100 and piston 115. The forces which efiect downward movement of the piston are augmented initiallyby kick-off spring 122. The force imparted to lever 57 to close the car door is transmitted directly to the door sections through links 58 and 60. The force due to weight 35 to close the hatchway door is imparted through lever 33 to the door by roller 37 which is pushed against shoulder 10 of bracket 26. The assisting forces for closing the hatchway door are transmitted through cam 85, roller 84, lever 57, links 58 and bracket 66. The buffer plate 65 supported by bracket 66 is pushed against cam 64 of crosshcad 28 which in turn pulls roller 37 against shoulder of bracket 26. The doors are locked together for simultaneous operation during their closing by rollers 84 and 72 which are maintained betweencams 71 and 85 as the closing operation takesplace. 1

Upon the doors nearing closed positions, piston 115 cuts off ports 14A to start the cushioning action. The movement of the doors, as well as that of the piston, is retarded. cam 71 acting in cooperation with roller 72 on lever 33 to transmit the retarding effect to the doors. The hatchway door is slowed down owing to its connection to lever 33 through crosshead 28 and springs 32. The car door is slowed down owing to its connection to lever 33 through bracket 66, plate and cam 64 on crosshead 28. As the doors reach closed positions, they engage bumpers 165 which bring'them to rest. Piston 115, however, continues its downward movementuntil it is brought to rest by the engagement of stop collar 150 with cap 103. This collar is positioned on the piston rod 100 at such point as to provide, the desired clearance between cam 71 and roller 72.

As the hatchway door comes to rest, roller 37'rides off shoulder 40 as a result of the upward swing of links 34 at their point of connection to lever 33. Continued move-' ment of the lever moves the roller into depression 38, looking the door. The lever is brought to rest by the engagement of crosshead 28 with bumpers 31. the lever comes to rest, switch 86-is closed.

As the car door arrives at closed position,

ordinary misalignments of the car with the floors and at the same time to allowfor relative shifting of the cam and roller 72 as operation of the doors takes place. In this connection it is to be noted that roller 72 is positioned somewhat below the horizontal center of the cam when the car is levelwith the floor and the doors are closed. However, it is above this center when the doe-rs are open, as is shown in Figure due to the downward movement of the cam after cranks 7d and 7 5 pass vertical positions in the door opening operation. Cam 6% also is of suflicient length to allow for ordinary misalignments of the car with the floors. Cam 85, however, is-shortowing to the fact that its relation to. roller 84% isfixed as a result of both of these elements being carried by the elevator car.

The closing of the doors may beeffected at a faster rate, if desired, by causing the pump to exhaust fluid from the cylinder 1 beneath the piston. 'This may be effected by arrangingv the control mechanism to cause energization of motor 162 foroppositerota---- tion. hen an arrangement is employed to cause opposite rotative movement of the pump for the door closing operation, the impeller of the pump acts during such ope posite rotative movement to draw fluid from the cylinder by way of the pressure cham- Asa. result, a partial vacuum is produced in the her 112 and discharge conduit 12% cylinder beneath the piston, causing more rapid downward movement of the piston and faster closing of the doors.

Both the car door. and the 'hatchway door may be manually opened if. desired. This is of particular'advantage in case the'power mechanism becomes ineffective to open the doors, as for example when there is a failore of power for ELPPllCiLt-lOllilO motor 162.

The doors are opened independently under beyond cam 85as the initial movement of. As cam 85 is not en-' gaged, the opening of the car door does not lever 57 takes lace.

result in the lifting of the door engine piston and the opening of the hatchway door,

Just before This is Thus, the force required to openthe car door manually is reduced to a minimum, permit 7 ting this door to be freely and easily. moved to openposition. v j

The hatchway door cannot be manually opened from the corridor side because of the action ofits locking mechanism, as previ ously explained. However, this door may be unlocked and opened from within the elevator car. With the car door opened, crosshead 28 is grasped and moved in the door opening direction. The application of manualforce to the crosshead to open the hatchway door first moves roller 37 out to the edge of shoulder 40, unlocking the door, and then moves the door to open position... As roller 72 moves away from cam 71 dur-.

ing this movement, the opening of the hatchway door does not result in the lifting of the door engine piston. Therefore, I the force required to open the hatchway door manually is also minimized, permitting the free and'easy movement of the door to open position. c a

. Uponthe doors being released, they are returned to closed positions by their biasing weights. Since the forces'which assisted in the closing of the doors during power operation are not present, the'doorsare closed slowly, thus avoiding injurious slamming asthey'reaeh their closed positions.

Should itbecome necessary or: desirable when the doors are closing to reverse-the movement of the doors, for example to avoid strikingza person entering or leaving the car, this may be done by energizing motor l62fin a direction to effect the door opening operation. Upon this being done, the pump builds up pressure immediately, causing the 7 piston tobe brought to an .immediate stop.

Continued movement or coasting of the doors invthe closing direction is prevented afterthe downward movement of'the piston is stopped. Cam 7l,-being brought to rest with the piston, transmits the stopping action to the doors through lever 33. The reversal of the doors follows immediately after they are brought to a stop, cam 71 pushing'against roller 72 on lever 33 to effect the openingoperation as previously explained. Thus, reversal of the doors after energization of motor 162 takes place almost instane-' ou'sly. Coasting of the doors in the opening direction after piston 115 has been'brought .to a stop as an incident to reversal is pre= vented by the action of cam 85.

The employment of gravity means or equivalent for effecting the closing ofthe doors 'isfiof advantage. These forces are small, thus avoiding injury to'persons who may be struck by a closing door and dam age to the installation, for example asa result of slamming as the doors reach closed position. When the doors are opened by the door engine, the engine, during closing,acts

as a long stroke dash-pot for insuring the closing of the doors at the desired speed.

Vhen the doors are openedmanually, the

doors close slowly owing .to the closing forces being relatively small as above set forth. door in closing strike an obstruction, such as a person entering or leaving the car, the

Door operating mechanism in accordance with the principles of the invention is of very simple construction yet absolutely posflfiitive and reliable in operation. The doors are disconnected from each other and-from,

the power mechanism when they are closed, but automatically become locked together and to the power mechan sm upon operation of this mechanism to open the doors. This disconnection of the doors from eachother and from the power mechanism permlts the ready independent manual opening of each door with an application of a minimum of -force. Also, the opening ofthe car door independently of the hatchway door insures that anoc'cupant within the car will be able to open the doors and leave the car in case of an emergency.

Although the power mechanism illustrated for causing rotative movement of shaft 81.

has many advantages, other arrangements may be employed if desired. The mechanism operated by the power mechanism may be employed to operate the hatchway door alone in cases where it'is desired to operate the car door in some other way or where no car door or gate is provided.

As many changes could be made in the 60" above construction and many apparentlywidely different embodiments of this invention could "be made without departing from the scope thereof, it is intended that all mat-'- ter contained-in the above description or shown in the accompanying drawings shall be interpreted as illustrativeand not in a limiting sense. I 7 i What is claimed is 1. In an elevator installation in which th elevator car is provided with a door and a door is provided at a landing served by the car; a member connected to the landing door; power mechanism, said mechanism being disconnected from said member when said doors are closed but, upon operation, en-

In either case, therefore, should a 'caricloor to open position. 1

gaging said member and thereafter acting" therethrough to open the landing door; and a member connected to the car door, said first" named member being provided with means which is'disconnected from the car door member when the doors are closed but which engages the car door member to open the car door upon the opening of the landing door by said power mechanism. 7

2. In an elevator installation in which the elevator car is provided with a door and a door is provided at a-landing served by the car; power mechanism for roperatingzsaid doors, said power mechanism having a moving part; an operating member for said landing door, said member being disconnected from said power mechanism when the landing door is closed so as to permit manual opening of thedoor without the exertion of additional force to operate the power mechanism, but having means positioned to be engaged by aimoving part of said power mechanism to enable said mechanism, upon operatiom'to move said landing door to open position; an operating member for said car door, said member being disconnected from said power mechanism and from said land-- ing door and its operating member so as to permit manual opening of the car door independently of'said landing door and without the exertion of additional force to operate said power mechanism; and means connected to said landing dooroperating member for engaging the car door operating member, upon landing door opening movement thereof by said powerinechanism, to move said 3. In an elevator installation elevator car is provided with adoor and a ,door is provided-at a landing served by the car; a member connected to the landing door; power mechanism, said mechanism being disconnectedtfrom said member when said doors are closed'but, upon operation,

engaging said member and thereafter acting therethrough to open the landing door; a member connected to the car door, said first named member being provided with means which is disconnected from the car door member when the doors are closed but which engages the car door member to open the car door upon the opening of the landing door by said power mechanism; and meansoper- 1 said doors, said mechanism being discon-- nected from said member when said doors are closed but engagingsaid member, upon in which the v operation, to move it about its pivot in a direction to open the landing door; an op erating member for the car door connected to said pivoted member'to be moved thereby;

and a member Connected tothe car door, said last named member being disconnected from the car door operating member when the doors are closed but being arranged in the path of movement thereof to be engaged thereby, upon operation of the landing door operating member, to open the car door.

5. In an elevator installation in which the elevator car is provided with a door and a door is provided at a landing served by the car; means for locking the landing door in closed position; a pivoted operating inem ber for said landing door; means connecting said member to said locking means; power mechanism for operating said doors, said mechanism being disconnected from said member when said landing door is closed and locked but engaging said member, upon operation, to move it about its pivot, said member thereupon operating said locking means to unlock the landing door and thereafter moving said door to open position; an operating member for the car door connected to said pivoted member to be moved thereby; and a member connected to the car door, said last named member being disconnected from the car door operating member when the doors are closed but being arranged in the path of movement thereof to be engaged thereby, upon operating of the landing door operating member, to open the car door.

6. In an elevator installation in which the elevator car is provided with a door and a door is provided at a landing served by the car; a lever pivotally mounted on the hatchway wall; means connecting the landing door to said lever for operation thereby; an operating member carried by said lever; power mechanism carried by the elevator car; means connected to said mechanism for operation thereby, said means being disconnected from said member when said doors are closed but, upon operation of said mechanism, engaging said member and thereafter acting therethrough to move said lever about 7 its pivot in a direction to open the landing door; an operating member for the car door connected to said lever to be moved thereby; and a member connected to the car door, said last named member being disconnected from the car door operating member when the doors are closed but being arranged in the path of movement thereof, said car door operating member operating, upon operation of said lever to move the landing door to open position, to engage said last named member and thereafter act therethrough to open the car door.

7. In an elevator installation in which the elevator car is provided with a door and a door is provided at a landing served by the car; alever pivotally mounted on the hatchway wall; means connecting the landing door to said lever for operation thereby; an operating member carried by :s'aid lever; power mechanism carried by the elevator car means connected to said mechanism for operatic thereby, said means beingdiseonnected ironisaid member; when said doors are closed but, upon operation of said mechanism, engaging said member and thereatter acting therethrough to move said lever about its pivot in a direction to open the landing door; an operating member'ior the cardoor connected to said lever to be moved thereby; amcmber connected to the car door, said last named memberbeing disconnected from the car door operating member when the doors are closed but being arranged in the path of movement thereoi'said car door operating member operating, upon operationof said lever to move the landing door to open position, to engage said last named member and thereafter act therethrough to open the car door; and meansoperable by said member connected to the car door and by said power mechanism during the initial door opening operation'to lock said doors to said power mechanism for simultaneous operation thereby.

8. In an elevator installation in which the elevator caris provided witha door and'a door is provided at a landing served by the car; a lever pivotally mounted on the hatch- Way wall; means connecting the landing door to said lever for operation thereby;

power mechanism carried by the elevator car; a cam connected to said mechanism to be moved thereb an o cratin roller car ried by said lever, said roller being disconnected from said cam but being positioned in the path of ,movementthereof to,be en gaged and moved thereby, upon operation of said mechanism, to move said lever about its pivot in a direction to open the landing.

door; a memberconnected to said lever to be moved thereby; and a member connected to the car door, said last named member being.

disconnected from the lever operated member when the doors are closed but being positioned in the path of movement'thereof to be engaged and moved thereby to open the car door, upon operation of said lever to move the landing door to open position.

9.- In an elevator installation in wh ch the elevator car is provided with adoor and a door is provided at a-landing served bvthe car; a lever pivotally mounted on the hatchway wall; means connecting the landing door to said lever for operation thereby; power mechanism carried by the elevator car; a cam connected to said mechanism to be moved thereby;an operating roller carried byrsaid lever, said roller being disconnected from said cam but being positioned in the path of movement thereof to beengaged and moved thereby, upon operation of said mechanism, to move said lever about its pivot in a direction to open the landing door; a member connected to said lever to be moved thereby; a member connected to the car door, said last named member being disconnectedfrom the lever operated member when the doors are closed but being positioned in the path of movement thereof to be engaged and moved thereby to open the car door, upon operation of said lever to move the landing door to open position; a lever connected to said member connected to the car door for operation thereby; a roller carried by the last named lever; and a cam operable by said power mechanism, said last named cam and roller being disconnected when said doors are closed but acting automatically upon movement thereof during the initial door opening operation to lock said doors together for simultaneous operation.

10. In an elevator installation in which the elevator car is provided with a door and a door is provided at a landing served by the car; means for locking the landing door in closed position; a lever pivotally mounted on the hatchway wall; means connecting said lever to said locking means; means con necting the hatchway door to said lever for operation thereby; power mechanism carried by the elevator car; a cam connected to said mechanism to be moved thereby; an op-' erating roller carried by said lever, said roller being disconnected from said cam but being positioned 1n the path of movement thereof to be engaged and moved thereby,

upon operation of said mechanism, to move said lever about its pivot to operate said locking means to unlock the landing door and thereafter to open the hatchway door; a cam connected to said lever to be moved thereby; a member connected to the car door, said member being disconnected from the last named cam when the doors are closed but being arranged in the path of movement] tion to lock said doors together for simul- V taneous operation until the doors are returned to closed positions; andimeans for biasing said doors to closed positions, said biasing means acting to close said doors upon EDWARD LEEDUNN. 

